linux-kernel - Re: [PATCH] m68k: Implement ndelay() as an inline function to force type checking/casting

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Message-ID: <20180514092334.43b5ee3c@xps13>
Date:   Mon, 14 May 2018 09:23:34 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-m68k@...ts.linux-m68k.org,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] m68k: Implement ndelay() as an inline function to force
 type checking/casting

Hi Boris,

On Sun, 13 May 2018 16:02:12 +0200, Boris Brezillon
<boris.brezillon@...tlin.com> wrote:

> ndelay() is supposed to take an unsigned long, but if you define
> ndelay() as a macro and the caller pass an unsigned long long instead
> of an unsigned long, the unsigned long long to unsigned long cast is
> not done and we end up with an "undefined reference to `__udivdi3'"
> error at link time.
> 
> Fix that by making ndelay() an inline function and then defining dummy
> ndelay() macro that redirects to the ndelay() function (it's how most
> archs do to implement ndelay()).
> 
> Fixes: c8ee038bd148 ("m68k: Implement ndelay() based on the existing udelay() logic")
> Signed-off-by: Boris Brezillon <boris.brezillon@...tlin.com>

Thanks for fixing it.

Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>


-- 
Miquel Raynal, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com